There are three sub specie of the African Grey
Parrot: Cameroon, Congo (CAG) and Timneh (TAG).
Not everyone feels that the Cameroon African Grey is a sub specie;
depends on who you talk to.

Lifespan: 40-60 years.
Size: 11-14 inches
Weight: The Congo weighs between 380 and 554 grams. The
Timneh weighs between 300 and 360 grams.
Noise Level: Low to Moderate.
Speaking Ability: Excellent
Demanding and/or Destructive: Moderate
Temperament: African Greys are friendly birds that can be shy.
They are also entertaining.
Requirements: African Greys require a cage that has plenty of room
for them to stretch their wings and play. They also require lots
of foraging toys and wood to chew on. They are smart birds that
enjoy family interaction as well as puzzles, clicker training, etc.